To improve your health, you can _________ 25— 30 minutes three or four times a week to do simple things such as walking ,cycling or running .A.give offB.turn downC.take overD.set aside
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D解析考查短语辨析。give off释放光线或气味，turn down 调低，拒绝，take over 接管，set aside 留出，抽出，句意：为了提高你的健康，你可以每周抽出三或四次25到30分钟的时间做一些简单的事情，如散步，骑自行车或跑步。故选D。